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Financial debt - Global Programs for the issuance of Notes (Details) | Nov. 16, 2016 USD ($) payment | Dec. 10, 2015 ARS ($) payment | Dec. 15, 2011 USD ($) | Dec. 02, 2010 USD ($) | Dec. 31, 2017 USD ($) | Dec. 28, 2017 USD ($) | Nov. 16, 2016 ARS ($) payment | May 26, 2016 USD ($)
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Term Notes | Minimum |  |  |  |  |  |  |  |
Financial Debt |  |  |  |  |  |  |  |
Minimum payable amount to default |  |  |  |  | $ 20,000,000 |  |  |
Minimum defaulted amount to final court sentence dictamination |  |  |  |  | $ 20,000,000 |  |  |
Telecom Argentina | Term Notes |  |  |  |  |  |  |  |
Financial Debt |  |  |  |  |  |  |  |
Amortization term |  |  | 5 years |  |  |  |  |
Telecom Argentina | Term Notes | Maximum |  |  |  |  |  |  |  |
Financial Debt |  |  |  |  |  |  |  |
Principal amount |  |  | $ 500,000,000 |  |  | $ 3,000,000,000 |  |
Personal | Term Notes |  |  |  |  |  |  |  |
Financial Debt |  |  |  |  |  |  |  |
Amortization term |  |  |  | 5 years |  |  |  |
Personal | Term Notes | Maximum |  |  |  |  |  |  |  |
Financial Debt |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 500,000,000 |  |  |  | $ 1,000,000,000
Personal | Series II |  |  |  |  |  |  |  |
Financial Debt |  |  |  |  |  |  |  |
Principal amount |  | $ 149,000,000 |  |  |  |  |  |
Amortization term |  | 36 months |  |  |  |  |  |
Number of debt payments | payment |  | 1 |  |  |  |  |  |
Percentage of capital settled |  | 100.00% |  |  |  |  |  |
Personal | Series II | Fixed interest rate | Until ninth month |  |  |  |  |  |  |  |
Financial Debt |  |  |  |  |  |  |  |
Borrowing interest rate |  | 28.75% |  |  |  |  |  |
Personal | Series II | Floating interest rate | After ninth month |  |  |  |  |  |  |  |
Financial Debt |  |  |  |  |  |  |  |
Floating interest rate |  | 4.00% |  |  |  |  |  |
Personal | Series III |  |  |  |  |  |  |  |
Financial Debt |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 721,969,404 |
Amortization term | 18 months |  |  |  |  |  |  |
Number of debt payments | payment | 1 |  |  |  |  |  | 1 |
Percentage of capital settled | 100.00% |  |  |  |  |  | 100.00% |
Personal | Series III | Floating interest rate |  |  |  |  |  |  |  |
Financial Debt |  |  |  |  |  |  |  |
Floating interest rate | 2.90% |  |  |  |  |  | 2.90% |
Personal | Series IV |  |  |  |  |  |  |  |
Financial Debt |  |  |  |  |  |  |  |
Principal amount | $ 77,900,400 |  |  |  |  |  | $ 1,207,000,000 |
Amortization term | 24 months |  |  |  |  |  |  |
Number of debt payments | payment | 1 |  |  |  |  |  | 1 |
Percentage of capital settled | 100.00% |  |  |  |  |  | 100.00% |
Personal | Series IV | Fixed interest rate |  |  |  |  |  |  |  |
Financial Debt |  |  |  |  |  |  |  |
Borrowing interest rate | 4.85% |  |  |  |  |  | 4.85% |

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